高一英语暑假作业及答案

1.No one knows _______ how the earth began, ___ it happened so long ago.

2.After that, atoms began to form and ________ to create stars and other bodies.

3.For several billion years after the ‘Big Bang’, the earth was still just ____________ dust.

4.The earth became so violent that it was not clear whether the ________ would last or not.

5.They were _________ to produce carbon, nitrogen, water vapour and other ______ , which

were to make the earth’s ______________.

6.What is even more important is that as the earth ______________ , water began to appear

on its surface.

7.It wasn’t immediately obvious that water was to be _____________ to the development of

life.

8.This produced a_______ reaction, which made it possible for life to develop.

9.Many millions of years later, the first _______ small plants began to appear on the

surface of the water.

10.They _______ and filled the oceans and seas with oxygen, which _________ the later

development of early shellfish and all sorts of fish.

ter when the plants grew into forests, ______ appeared for the first time.

12.They produced young ________ by laying eggs.

13.Dinosaurs laid eggs too and _________ on the earth for more than 140 million years.

14.Why they suddenly disappeared still remains a __________.

15.This disappearance made possible __________ mammals on the earth.

16.So whether life will continue on the earth for millions of years to come will _______

whether this problem can be solved.

17.Going eastward, you'll pass mountains and thousands of lakes and forests,

__________ wide rivers and large cities.

18.Some people have the idea that you can cross Canada ___________ five days, but

they forget the fact that Canada is 5,500 kilometers from coast to coast.

19.Its population is increasing____________.

20.It is so wet there that the trees are extremely tall, some_________ over 90 meters.

21.Cowboys from all over the world come to _________ in the Stampede.

22.Many of them have _________ riding wild horses and can win thousands of dollars in

prizes.

23.They went through a wheat-growing ___________ and saw farms that covered

thousands of acres.

24.The girls were surprised ___________ ocean ships can sail up the Great Lakes.

25.Because of the Great Lakes, they learned, Canada has more _________ than any

other country in the world.

26.It has one-third of the world's total fresh water, and _________ is in the Great Lakes.

27.That night as they slept, the train ____________ the top of Lake Superior, through the

great forests and southward towards Toronto.

28.Their next stop was Calgary, which is _________ for the Calgary Stampede.

29.If you go to Hollywood and ____________ the trendy coffee shops and restaurants, it’s

unlikely you’ll meet your favorite film star.

30.Dennis is a ‘movie’ star------well,_________.

31.On his _________ Chevrolet ___________ he has five Oscars and other awards he has won.